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The generation of the below threshold harmonics (BTHs) under differentdriving laser intensities is investigated. The linearly shifting of photonenergy and resonantly enhancement of photon yield of the harmonics from 23rd(H23) to 27th (H27) are found by changing the laser intensity around 18.6TW/cm2. It is identified that this driving laser intensity dependence is due tothe transient ac Stark-shifted resonance between the first excited state andthe ground state. With this transient ac Stark, the linearly shifting of thephoton energy can be interpreted very well by considering the sub-cycleelectron dynamics for BTH generation, which shows that the generation of theBTHs is surprisingly similar to the plateau harmonics.

Sub-cycle Electron Dynamics in the Generation of Below Threshold Harmonics